FKIE_CVE-2026-50305

Vulnerability from fkie_nvd - Published: 2026-07-14 18:17 - Updated: 2026-07-16 19:41
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
Use after free in Microsoft Brokering File System allows an authorized attacker to elevate privileges locally.
References
secure@microsoft.comhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50305Patch, Vendor Advisory
Impacted products
Vendor Product Version
microsoft windows_11_24h2 *
microsoft windows_11_24h2 *
microsoft windows_11_25h2 *
microsoft windows_11_25h2 *
microsoft windows_11_26h1 *
microsoft windows_11_26h1 *
microsoft windows_server_2025 *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "product": "Windows 11 Version 24H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26100.8875",
              "status": "affected",
              "version": "10.0.26100.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "product": "Windows 11 Version 25H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26200.8875",
              "status": "affected",
              "version": "10.0.26200.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "product": "Windows 11 version 26H1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.28000.2269",
              "status": "affected",
              "version": "10.0.28000.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2025",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26100.33158",
              "status": "affected",
              "version": "10.0.26100.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2025 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26100.33158",
              "status": "affected",
              "version": "10.0.26100.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "secure@microsoft.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*",
              "matchCriteriaId": "6D55C01A-5908-4CFC-BEB6-BBF3B6F0C5AF",
              "versionEndExcluding": "10.0.26100.8875",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*",
              "matchCriteriaId": "740B730D-AEC5-4735-A122-B1CF8B3C364C",
              "versionEndExcluding": "10.0.26100.8875",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*",
              "matchCriteriaId": "E26E96B6-1469-46AE-9CB5-AB7A0372C398",
              "versionEndExcluding": "10.0.26200.8875",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*",
              "matchCriteriaId": "DDBCA9E4-7BFB-423A-B7A7-9CBF5625053D",
              "versionEndExcluding": "10.0.26200.8875",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*",
              "matchCriteriaId": "8967AF79-CAD0-4F87-85A5-95D031C9FEFA",
              "versionEndExcluding": "10.0.28000.2269",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*",
              "matchCriteriaId": "8E90830B-0BD1-4D01-9C7D-0F0E1828A0F5",
              "versionEndExcluding": "10.0.28000.2525",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "22BE2FE9-37B9-4FF2-B43A-60A3518E0F08",
              "versionEndExcluding": "10.0.26100.33158",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Use after free in Microsoft Brokering File System allows an authorized attacker to elevate privileges locally."
    }
  ],
  "id": "CVE-2026-50305",
  "lastModified": "2026-07-16T19:41:59.217",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-50305",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-15T03:57:15.525766Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-14T18:17:28.377",
  "references": [
    {
      "source": "secure@microsoft.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50305"
    }
  ],
  "sourceIdentifier": "secure@microsoft.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        },
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "secure@microsoft.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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